Circle Milling A Bolt Hole Pattern

There are times when you want to circle mill the holes on a bolt pattern. Possibly you want to rough the holes prior to finish boring.

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From:
12/1/2007
Modern Machine Shop,
Mike
Lynch

There are times when you want to circle mill the holes on a bolt pattern. Possibly you want to rough the holes prior to finish boring. Here is a custom macro program (actually a combination of three custom macros) that allows you to do so. First let’s look at an example main program and explain the input variables: